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Simplifying 21 + -7K = -3K + 4 Reorder the terms: 21 + -7K = 4 + -3K Solving 21 + -7K = 4 + -3K Solving for variable 'K'. Move all terms containing K to the left, all other terms to the right. Add '3K' to each side of the equation. 21 + -7K + 3K = 4 + -3K + 3K Combine like terms: -7K + 3K = -4K 21 + -4K = 4 + -3K + 3K Combine like terms: -3K + 3K = 0 21 + -4K = 4 + 0 21 + -4K = 4 Add '-21' to each side of the equation. 21 + -21 + -4K = 4 + -21 Combine like terms: 21 + -21 = 0 0 + -4K = 4 + -21 -4K = 4 + -21 Combine like terms: 4 + -21 = -17 -4K = -17 Divide each side by '-4'. K = 4.25 Simplifying K = 4.25
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